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A review of the North American species of Hemipenthes Loew, 1869 (Diptera: Bombyliidae)
By Ávalos-Hernández O.
Zootaxa 2074: 1-49, 2009
Cite: 1042482 with citation markup [cite:1042482]

Bumped into PDF for this paper with nice (color!) plates
To download the Ávalos-Hernández Hemipenthes review, click the blue, rectangular, link labelled "Download Full-Text PDF" at upper right on the web page below:

If you get a pop-up window asking you to join ResearchGate I'm pretty sure you can dismiss it (by clicking the "X" at upper right), and then download the paper without registering.

This is a nice revision! Hopefully the above URL will remain a stable (working) link.